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通过选择甲醇、乙醇、乙二醇和二甲亚砜四种不同折射率液体作为溶剂溶解分散掺杂有尺寸为100nm的AlN纳米粒子的罗丹明6G(Rh6G)激光染料,制备出了不同折射率溶剂的Rh6G随机激光体系。分别测量了这些体系的随机激光光谱和阈值,研究了在溶剂的折射率不同的随机激光体系中光谱、阈值特性与溶剂折射率的关系。对于光谱特性,发现随溶剂的变化,随机激光峰值位置发生明显变化,这主要是由溶剂的吸收位置不同所导致的;在阈值特性方面,观察到阈值随着溶剂折射率的增大而增大。通过引入米氏散射理论,解释了产生这种阈值变化特征的原因是溶剂折射率增大会使随机激光体系的散射强度减小、传输自由程增大。
The Rhodamine 6G (Rh6G) laser dye doped with AlN nanoparticles with the size of 100 nm was prepared by selecting four different refractive index liquids (methanol, ethanol, ethylene glycol and dimethylsulfoxide) as solvent to prepare different refractive index solvents Rh6G random laser system. The stochastic laser spectra and thresholds of these systems were measured respectively. The relationship between the spectra and the threshold properties of the system in the random laser system with different refractive indices of solvents was investigated. For the spectral properties, it was found that with the change of the solvent, the position of the random laser peak changed obviously, which was mainly caused by the different absorption position of the solvent. On the threshold characteristic, it was observed that the threshold value increased with the increase of the refractive index of the solvent . The introduction of Mie scattering theory explains that the reason for this threshold variation is that the increase of solvent refractive index will reduce the scattering intensity of random laser system and increase the free path of transmission.